Rope drum and method for the production thereof

Abstract

The present invention relates to rope drums for winding and unwinding ropes, having a drum shell, to which end disks are fastened at the end faces, and to rope winches having such rope drums. The invention also relates to a method for producing such a rope drum. According to the invention, the drum shell is seamlessly rolled from an annular workpiece blank by means of a rope groove profile embossed in a non-cutting manner.

We claim: 
     
       1. A method of manufacturing a rope drum comprising a drum casing and end plates attached thereto at an end face, the method comprising:
 seamlessly rolling the drum casing from an annular workpiece blank by a rolling apparatus, 
 forming a rope groove profile at an outer casing surface of the drum casing during and/or after the seamlessly rolling of the drum casing, wherein forming the rope groove profile at the outer casing surface of the drum casing comprises non-cutting machining the rope groove profile by a tool that is mapped in the outer casing surface, 
 forming a rising region for a rope by a rolling process at the outer casing surface at at least one end section of the drum casing, and 
 further forming the rising region by joining a separate part to an annular joining surface formed by the rolling process. 
 
     
     
       2. The method of  claim 1 , wherein forming the rope groove profile at the outer casing surface of the drum casing further comprises rolling a rolling tool that is mapped in the outer casing surface. 
     
     
       3. The method of  claim 1 , wherein an inner casing surface of the drum casing is formed as smooth and/or without a groove profile so that when the drum casing is viewed in cross-section, a wall thickness of the drum casing is cyclically thinner and thicker between the inner casing surface and the outer casing surface having the rope groove profile. 
     
     
       4. The method of  claim 1 , further comprising pressure forming the annular workpiece blank at a casing surface side by a main roll and by a mandrel roll that have a radial roll gap between them while rotating the annular workpiece blank about a blank axis of rotation. 
     
     
       5. The method of  claim 4 , further comprising pressure forming the annular workpiece blank at an end face side between at least one pair of axial rolls that have an axial roll gap between them. 
     
     
       6. The method of  claim 5 , further comprising using conical axial rolls that taper toward a center of the annular workpiece blank and are arranged in a common plane that passes through the main roll and the mandrel roll. 
     
     
       7. The method of  claim 1 , further comprising forming the end plates separately from the drum casing and subsequently joining the end plates to the drum casing, wherein the subsequently joining comprises screwing. 
     
     
       8. The method of  claim 1 , wherein the annular workpiece blank comprises a cast blank or is shaped in a mandrel roll step and/or a forge step from an initially hole-less blank.